SQL 过程无法正常工作/使用 SQL 命令非常慢

发布于 2024-12-25 02:17:17 字数 326 浏览 1 评论 0原文

我有以下场景；

Dim cmd as New SQLCommand
cmd.Connection = myopenconnection
cmd.CommandText = "usp_getdata"
cmd.Parameters.AddWithValue("@Year", 2008)
cmd.CommandType = StoredProcedure
Dim reader = cmd.ExecuteReader

执行上述操作时，应用程序会卡住并一直等待响应。我尝试从 SQL Management studio 执行 SQL 命令，它在数据库的另一个副本上运行良好。

原文

I have the following scenario;

Dim cmd as New SQLCommand
cmd.Connection = myopenconnection
cmd.CommandText = "usp_getdata"
cmd.Parameters.AddWithValue("@Year", 2008)
cmd.CommandType = StoredProcedure
Dim reader = cmd.ExecuteReader

The application get stuck and keep waiting for a response when the above is excuted. I have tryed to execute the SQL command from SQL Management studio and it works fine and on another copy of the database.

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我做我的改变 2025-01-01 02:17:17

执行不返回数据的存储过程

不调用 SqlCommand.ExecuteReader()，而是调用 SqlCommand.ExecuteNonQuery()。

根据此 MSDN 参考：

执行读取器
执行返回行的命令。为了提高性能，
ExecuteReader 使用 Transact-SQL sp_executesql 调用命令
系统存储过程。因此，ExecuteReader 可能没有
如果用于执行 Transact-SQL 等命令，则可以达到您想要的效果
SET 语句。
执行非查询
执行 Transact-SQL INSERT、DELETE、UPDATE 和 SET 等命令
声明。

编辑：

执行存储过程来检索数据

或者，如果您想要返回标量值，则可以使用SqlCommand.ExecuteScalar()。但是，如果您希望获取数据，则需要使用 SqlDataReader 对象，如下所示：

Dim queryString As String = "usp_getdata"

    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand(queryString, connection)
        command.CommandType = CommandType.StoredProcedure
        connection.Open()

        Dim reader As SqlDataReader = command.ExecuteReader()

        ' Call Read before accessing data.
        While reader.Read()
            Console.WriteLine(String.Format("{0}, {1}", _
                reader(0), reader(1)))
        End While

        ' Call Close when done reading.
        reader.Close()
    End Using

SqlDataReader 类参考

Execute a stored procedure with no data return

Instead of calling SqlCommand.ExecuteReader(), call SqlCommand.ExecuteNonQuery().

As per this MSDN reference:

ExecuteReader
Executes commands that return rows. For increased performance,
ExecuteReader invokes commands using the Transact-SQL sp_executesql
system stored procedure. Therefore, ExecuteReader might not have the
effect that you want if used to execute commands such as Transact-SQL
SET statements.
ExecuteNonQuery
Executes commands such as Transact-SQL INSERT, DELETE, UPDATE, and SET
statements.

EDIT:

Execute a stored procedure to retrieve data

Or if what you're trying to do is return a scalar value, you can use SqlCommand.ExecuteScalar(). But if you're looking to get data, you need to utilize a SqlDataReader object, like so:

Dim queryString As String = "usp_getdata"

    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand(queryString, connection)
        command.CommandType = CommandType.StoredProcedure
        connection.Open()

        Dim reader As SqlDataReader = command.ExecuteReader()

        ' Call Read before accessing data.
        While reader.Read()
            Console.WriteLine(String.Format("{0}, {1}", _
                reader(0), reader(1)))
        End While

        ' Call Close when done reading.
        reader.Close()
    End Using

SqlDataReader Class Reference

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千纸鹤 2025-01-01 02:17:17

代码非常慢/无法工作；

  Dim cmd As New SQLCommand
  cmd.Connection = myopenconnection
  cmd.CommandText = "usp_getdata"
  cmd.Parameters.AddWithValue("@Year", 2008)
  cmd.CommandType = StoredProcedure
  Dim reader = cmd.ExecuteReader

通过将上述代码修改为，问题得到解决；

 Dim cmd As New SQLCommand
 cmd.Connection = myopenconnection
 cmd.Parameters.AddWithValue("@Year", 2008)
 cmd.CommandText = "Exec usp_getdata @Year With Recompile"
 cmd.CommandType = Text
 Dim reader = cmd.ExecuteReader

Very slow/not working code;

  Dim cmd As New SQLCommand
  cmd.Connection = myopenconnection
  cmd.CommandText = "usp_getdata"
  cmd.Parameters.AddWithValue("@Year", 2008)
  cmd.CommandType = StoredProcedure
  Dim reader = cmd.ExecuteReader

The problem was solved by modifiying the above code to;

 Dim cmd As New SQLCommand
 cmd.Connection = myopenconnection
 cmd.Parameters.AddWithValue("@Year", 2008)
 cmd.CommandText = "Exec usp_getdata @Year With Recompile"
 cmd.CommandType = Text
 Dim reader = cmd.ExecuteReader

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